mariusGundersen

// Example 10: add a tuple

// This is just a dummy class that we can use in the example
public class City
{
  public City(string name, int population, string country)
  {
    Name = name;
    Population = population;
    Country = country;

mariusGundersen

// Example 11: add with params

// Use params to take several ints, each representing 3 digits
public static void Add<TKey>(this IDictionary<TKey, int> dictionary, TKey key, params int[] values)
=> dictionary.Add(key, values.Aggregate(0, (s, v) => s*1000 + v));

// Now we can write it like this
var populations = new Dictionary<string, int>
{
  { "China", 1,409,517,397 },